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This paper presents results on liquid-vapor, solid-vapor, liquid-liquid, and crystal-melt equilibria in solvent-solute systems. The data provide a physicochemical basis for the development of processes for the ultrapurification of volatile compounds of group II to VI elements (halides, hydrides, metalorganic compounds, and elemental substances).
Data are presented on the evolution of the pyrochlore structure in the Ln2+xHf2−xO7−δ (Ln = Sm, Eu; x = 0.096) solid solutions and Ln2Hf2O7 (Ln = Gd, Tb) compounds prepared from mechanically activated oxide mixtures. Sm2.096Hf1.904O6.952 is shown to undergo pyrochlore-disordered pyrochlore-pyrochlore (P-P1-P) phase transformations in the temperature range 1200–1670°C. The former transformation leads...
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